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Neither ;) It's a sponge.
The anemone's are Metridium senile
I'm pretty sure that this is Chromodoris tinctoria, although it's close enough to the (thought to be extinct) Chromodoris petechialis that it would be a good idea to send your photo to a Nudibranch expert.
http://www.seaslugforum.net/find/chropet...
Could be an exciting find!
What a beautiful specimen. Very highly coloured :)
Who knew pidgeons could be so pretty.
Possibly Jorunna funebris, although the black spines are usually concentrated into spots in that species. These Jorunna feed on blue sponge.
I know! It's definitely my favourite :)
There are 3 species of Bullia in South Africa. They all use their foot like a sail to surf up and down the beach with the tide.